How far in is the sigmoid colon? Sigmoid colon. The sigmoid colon (or pelvic colon) is the part of the large intestine that is closest to the rectum and anus. It forms a loop that averages about 3540 cm (13.78-15.75 in) in length., You can Find A Cancer Hospital Please Join Here, Please join All Cancer Treatment Centers, Be sure to consult your doctor, Health Guide
